The problem of finding intersection point of triangle mesh
조회 수: 4 (최근 30일)
이전 댓글 표시
Now I have drawn a triangle mesh. (The function to generate image I use are as follows. )I want to ask for the intersection point, as shown in the figure(Red line with the mesh). But I don't know how to solve it.
PS:You can define the expression of a line at will,like "x=5".
If you want, I have some expression here.
trimesh(face', vertex(1,:), vertex(2,:), vertex(3,:),'LineWidth',1,'EdgeColor','k');
hold off;
vertex0=vertex';
V=vertex0(:,1:2);
x1=V(:,1);
y1=V(:,2);
z1=repmat(-20,1380,1);
tr = triangulation(face',x1,y1,z1); %x1.y1.z1 is a set of three coordinates of vertices
trimesh(tr);
axis equal;
colorbar('vert');
brighten(-0.1);axis on; % 'face' is the index list of triangle patch vertices;'vertex' is the index list of triangle vertex coordinates.
댓글 수: 2
채택된 답변
darova
2019년 11월 24일
편집: darova
2019년 11월 24일
To check every edge:
for j = 1:size(face,2)
i1 = 1;
for i2 = [2 3 1]
% checking edges [1 2], [2 3], [3 1]
xx = [V(face(i2,j),1) V(face(i1,j),1)];
yy = [V(face(i2,j),2) V(face(i1,j),2)];
% intersection of edge and line x = [20 -150], y = [-40 -40]
[xc,yc] = polyxpoly(xx,yy,[20 -150],[-40 -40]);
i1 = i1+1;
% if intersection exists
if ~isempty(xc)
plot(xc,yc,'.r')
end
end
end
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Surface and Mesh Plots에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!